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Re-Evaluation of the Haarlem Archaeopteryx and the Radiation of Maniraptoran Theropod Dinosaurs Christian Foth1,3 and Oliver W

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Re-Evaluation of the Haarlem Archaeopteryx and the Radiation of Maniraptoran Theropod Dinosaurs Christian Foth1,3 and Oliver W Foth and Rauhut BMC Evolutionary Biology (2017) 17:236 DOI 10.1186/s12862-017-1076-y RESEARCH ARTICLE Open Access Re-evaluation of the Haarlem Archaeopteryx and the radiation of maniraptoran theropod dinosaurs Christian Foth1,3 and Oliver W. M. Rauhut2* Abstract Background: Archaeopteryx is an iconic fossil that has long been pivotal for our understanding of the origin of birds. Remains of this important taxon have only been found in the Late Jurassic lithographic limestones of Bavaria, Germany. Twelve skeletal specimens are reported so far. Archaeopteryx was long the only pre-Cretaceous paravian theropod known, but recent discoveries from the Tiaojishan Formation, China, yielded a remarkable diversity of this clade, including the possibly oldest and most basal known clade of avialan, here named Anchiornithidae. However, Archaeopteryx remains the only Jurassic paravian theropod based on diagnostic material reported outside China. Results: Re-examination of the incomplete Haarlem Archaeopteryx specimen did not find any diagnostic features of this genus. In contrast, the specimen markedly differs in proportions from other Archaeopteryx specimens and shares two distinct characters with anchiornithids. Phylogenetic analysis confirms it as the first anchiornithid recorded outside the Tiaojushan Formation of China, for which the new generic name Ostromia is proposed here. Conclusions: In combination with a biogeographic analysis of coelurosaurian theropods and palaeogeographic and stratigraphic data, our results indicate an explosive radiation of maniraptoran coelurosaurs probably in isolation in eastern Asia in the late Middle Jurassic and a rapid, at least Laurasian dispersal of the different subclades in the Late Jurassic. Small body size and, possibly, a multiple origin of flight capabilities enhanced dispersal capabilities of paravian theropods and might thus have been crucial for their evolutionary success. Keywords: Maniraptora, Anchiornithidae, Late Jurassic, Biogeography, Radiation Background Recent discoveries in the probably Oxfordian Tiaojishan Having been discovered only 2 years after Darwin’s[1] Formation [6, 7] of eastern China have changed this pic- prediction that intermediate forms of different clades ture. In the past 15 years, numerous taxa of maniraptoran should be present in the fossil record, the famous ‘Urvogel‘ coelurosaurs were found in this formation. Although the Archaeopteryx from the Solnhofen limestones of southern phylogenetic relationships of these taxa are still disputed Germany [2] has not only played an important role in [4, 5, 8, 9], at least the genera Anchiornis and Xiaotingia the initial discussion of Darwin’s theory [3], but became are usually considered to form a monophyletic, endemic the ‘yard-stick’ for bird evolution – the taxon to which clade [4, 8–10], which were recently considered to be the any new relevant discovery is compared [4, 5]. How- oldest known avialans [9]. Indeed, with the exception of ever, Archaeopteryx remainedtheonlyJurassicparavian some fragmentary and questionable remains (mainly theropod known from diagnostic material for more than isolated teeth), no paravian theropod but Archaeopteryx 100 years. has so far been reported from Jurassic rocks outside China. Although the discovery of the first Archaeopteryx skeleton * Correspondence: [email protected] was announced by von Meyer [2], a fragmentary paravian 2SNSB-Bayerische Staatssammlung für Paläontologie und Geologie, theropod was found 6 years earlier, but misidentified as a Ludwig-Maximilians-University Munich, Department for Earth and new species of the pterosaur Pterodactylus, P. crassipes [11]. Environmental Sciences, and GeoBioCenter, Richard-Wagner-Str. 10, 80333 Munich, Germany It was not until 1970 that this specimen (Fig. 1) was Full list of author information is available at the end of the article correctly identified as theropod and referred to the genus © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Foth and Rauhut BMC Evolutionary Biology (2017) 17:236 Page 2 of 16 which is most probably the reason why this specimen has not been included in previous evaluations of the pro- portions of Archaeopteryx [14, 15]. Ostrom [16] and Wellnhofer [13] provided measurements for this speci- men, but noted that most of them where either incomplete, or based on estimations. In order to compare the Haarlem specimen to other Archaeopteryx specimens, we thus took new measurements from a high quality cast held at the Bayerische Staatssammlung für Paläontologie und Geologie (SNSB-BSPG 1971 I 211), and verified anatomical fea- tures by personal observations of the original specimen (Teylers Museum TM 6928, 6929), which was examined in July 2016. Only elements that could be measured directly or estimated with high certainty were considered here (Table 1). Elements that can be measured with precision include metacarpals I and III, manual phalanx I-1, manual unguals I and III, as well as pedal ungual III. Parts of the metacarpals Fig. 1 Overview of the “Haarlem specimen”, holotype of Ostromia or their impressions are found on both the main and crassipes (Meyer, 1857). Counterslab, Teylers Museum TM 6929 (left) counterslab and can be used to establish the length of these and main slab, TM 6928 (right). Rectangles indicate areas detailed in elements. Thus, the proximal end of metacarpal I is Fig. 3 (yellow) and Fig. 6 (white) preserved on the main slab, whereas an impression of its distal end is present on the counterslab. The proximal part of metacarpal II is clearly preserved as impression on Archaeopteryx [12], and it has since been known as the the counterslab, but the distal end of this element is Haarlem specimen, as it is kept in Teylers Museum in obscured by a dissolved area, a typical feature of the lime- Haarlem, the Netherlands [13]. stones of Jachenhausen [17]. However, as the metacarpus A re-examination of the Haarlem specimen of Archaeop- was obviously preserved in complete articulation, the teryx failed to identify any shared apomorphic/diagnostic proximal end of metacarpal II is a good indicator for the characters with other Archaeopteryx specimens, but approximate position of the proximal end of metacarpal revealed important differences that make a referral to III, and most of the shaft and the distal end of the latter this taxon untenable, but indicate a relationship to are preserved as impression on the counterslab. Most of Anchiornis and relatives. manual phalanx I-1 is preserved on the counterslab, and both its proximal and distal extremities are clearly marked Methods Anatomical comparison Both the original of the Haarlem specimen, as well as a Table 1 Selected measurements of paravian theropods high quality cast kept at the Bayerische Staatssammlung Specimen mcI mcIII mpI-1 muI muIII tibia mt puIII für Paläontologie und Geologie in Munich were studied London –– – –– 80.7 44.1 10.3 in detail, using binokular microscopes. The specimen Berlin 8.3 24.8 20.5 9.6 7.3 68.5 37 8.1 was compared to other specimens of Archaeopteryx on Maxberg 9.8 30 25 9.9 8.4 76.5 41.5 – the basis of personal observations of one or both of the Eichstätt 5.5 16.5 15.6 6.9 5.2 52.5 30.2 6.1 authors on all 12 known specimens of Archaeopteryx, Solnhofen –– 28 13.8 10.4 92 47.5 11.7 except the London and Maxberg specimens. However, of these specimens, high quality casts held at the BSPG München 7.2 23.5 20 9.2 6.7 73 40 7.4 were studied. Specimens of Anchiornis, including the Thermopolis 6.6 22 19.5 –– 74,6 39.6 – holotype, and several other theropods of the Jehol 11th 9.9 31.5 23.3 11.6 10 76.3 40.3 8.1 Biota were personally studied by one of us (CF), and Haarlem 10.5 23.2 23.1 9.5 8.3 80 48 7.8 high-resolution photographs of additional specimens of Anchiornis 12.5 30.5 26.2 15.6 13.8 106.4 55.2 13.7 Anchiornis, Eosinopteryx,andAurornis were graciously Selected measurements (in mm) of the Haarlem specimen and several other provided by Markus Moser, Pei Rui, Helmut Tischlinger, specimens of Archaeopteryx, as well as the anchiornithid Anchiornis. and Wang Xiaoli. Measurements of the Haarlem specimen and measurements of unguals (except for Anchiornis) were taken by us, other measurements taken from The incomplete preservation of the Haarlem specimen Wellnhofer [13] and Hu et al. [32]. Abbreviations: mp, manual phalange; mc, (Fig. 1) precludes exact measurements for most long bones, metacarpal; mt, metatarsus; mu, manual ungual; pu, pedal ungual Foth and Rauhut BMC Evolutionary Biology (2017) 17:236 Page 3 of 16 as sharp impressions so that the length of this bone can in this specimen, so that this identification should be be established with certainty. Two manual unguals are regarded as tentative. preserved. One of them is associated, though not articu- lated with phalanx I-1 and is therefore interpreted as the Phylogenetic and paleogeographic analyses ungual of digit I. The other ungual is articulated with the In order to test the affinities of the Haarlem specimen, distal end of a slender phalanx distal to the dissolved area we added this specimen to an updated version of the on the counterslab. As the phalanx seems to be too slender phylogenetic matrix of Foth et al. [9]. Several character to represent the much more robust digit II, we concur with codings were revised, and one additional character was Ostrom [16] and Wellnhofer [13] that this element repre- added.
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